ANTIBIOTIC SUSCEPTIBILITY PATTERN OF ENTERIC BACTERIA ISOLATED FROM LAYERS CHICKENS
Abstract
The study investigated the antimicrobial susceptibility patterns of enteric bacteria isolated from
layer chickens in Abeokuta, Ogun State, Nigeria, to identify resistant strains and evaluate their
biochemical characteristics. Antibiotic susceptibility testing was conducted using the Kirby–Bauer
disc diffusion method. A total of 6 isolates were recovered from cloacal swab samples collected
from layer chickens. Gram staining indicated both Gram-negative and Gram-positive cocci,
although the majority were Gram-negative, consistent with enteric bacteria such as Escherichia
coli and Klebsiella spp. Results showed that most isolates were susceptible to all tested antibiotics,
with inhibition zones ranging from 14 mm to 34 mm. However, one isolate Shigella sonnei was
resistant to three antibiotics—Gentamycin, Ampiclox, and Amoxicillin multidrug resistance
(MDR). The study concludes that while the majority of enteric bacteria isolated from layer
chickens in the study area remain sensitive to antibiotics.
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